Regarding the piping material for the bottom reduction pump
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The temperature of the pump at the bottom of the vacuum tower is 360 degrees, with a pressure of 1.2 Mpa. The original design specified Cr5mo as the material for the pipes. Now an additional pump has been added; due to the variety of pipe fittings and the small quantities required, it is inconvenient to procure them. Additionally, welding them on-site requires heat treatment. Therefore, considering using 20# steel or 16Mn as an alternative. Is it feasible to use 20# steel? It was used in many old installations in the past; I’m not sure if there are any new regulations regarding this. Is heat treatment necessary when using 16Mn steel? Please ask my friends for help.
The material choice is related to the sulfur content and acid value of the crude oil; if corrosion is a concern, Cr5Mo or TP321 is preferable
What is the diameter of your pipe? If it’s 16 mm, the wall thickness should be less than that required for heat treatment. You need to follow the new standards; don’t simply rely on the old ones, as the new standards are much stricter in terms of safety
Well, I really don’t know which new standard specifies this aspect. That friend can provide the standard number for this specification!